ライブラリインストール

$ pip install pycryptodome
$ pip install pycryptodomex

settings.py にキーを記載

$ vim settings.py

# AES 暗号
try:
   from .aes_key import *
except ImportError:
   AES_KEY='oDZC5a6rhyukFmKCbPS6M45TFROLmrlB'

$ vim aes_key.py

AES_KEY='dMchLlLllvrDtQUxXDLpAWr2v1EdjuLU'

確認

$ python manage.py shell

from project.settings import *
print(AES_KEY)

cipherクラスの作成

import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES
from Crypto.Util import Padding


class AESCipher(object):
   def __init__(self, key):
       self.key = (hashlib.md5(key.encode('utf-8')).hexdigest()).encode('utf-8')

   def encrypt(self, raw):
       iv = Random.get_random_bytes(AES.block_size)
       cipher = AES.new(self.key, AES.MODE_CBC, iv)
       data = Padding.pad(raw.encode('utf-8'), AES.block_size, 'pkcs7')
       return base64.b64encode(iv + cipher.encrypt(data)).decode('utf-8')

   def decrypt(self, enc):
       enc = base64.b64decode(enc.encode('utf-8'))
       iv = enc[:AES.block_size]
       cipher = AES.new(self.key, AES.MODE_CBC, iv)
       data = Padding.unpad(cipher.decrypt(enc[AES.block_size:]), AES.block_size, 'pkcs7')
       return data.decode('utf-8')

呼出し

import random
import string
from project.lib.cipher import AESCipher

raw_text = 'こんにちは'

key = 'y6lLepZQpppdzjkeG5MhUaaaRCychpDd'
print('key:' + key)

cipher = AESCipher(key)

encrypted_text = cipher.encrypt(raw_text)
print(encrypted_text)

decrypted_text = cipher.decrypt(encrypted_text)
print(decrypted_text)